[Campbell Biology P.827] The passage discusses both animal Hox genes and the maize gene KNOT... | Practice Question

The passage discusses both animal Hox genes and the maize gene KNOTTED-1, which is a homolog of Hox genes. Which of the following statements accurately describes a key functional difference between them?

  • A: Animal Hox genes primarily control leaf shape, while KNOTTED-1 influences embryonic structure placement.
  • B: KNOTTED-1 affects the number or placement of plant organs, whereas animal Hox genes determine leaf morphology.
  • C: Animal Hox genes are critical for the proper number and placement of embryonic structures, while KNOTTED-1 is important in the development of leaf shape.
  • D: Both genes function identically across animals and plants in controlling body plan development.

Explanation

The text states: 'The homeotic Hox genes that encode such transcription factors are critical for the proper number and placement of embryonic structures, such as legs and antennae, in the fruit fly Drosophila.' In contrast, for KNOTTED-1, it states: 'KNOTTED-1 is, however, important in the development of leaf shape, including the production of compound leaves.' This clearly delineates their different functional roles.